Is it permissible for the husband to stay with his virgin fiancée for fifteen days without the consent of his first wife, who demands her rightful share of nights after the seven nights stipulated by Islamic law?

If a man marries a virgin while already having a wife, the Sunnah is for him to stay with her for seven days, then return to his first wife and divide his time equally between them. It is not permissible for him to stay with the new wife for more than seven nights without the first wife's consent. If he stays with her for more than that, he must make up the extra nights only to the first wife.